How to call an array of scopes on an ActiveRecord object?

问题

I have an Article model which has recent, compiled, featured scopes. I can chain these scopes like this:

Article.recent.compiled.featured

Now I have an array of these scopes:

scopes = [:recent, :compiled, :featured]
or
scopes = [:recent, :compiled]

I don't know beforehand how many scopes are there in the scopes variable. I just know it's an array of scopes.

How can I use this array as a chain of scopes to be called on the Article model as mentioned above?

回答1:

just use inject:

scopes.inject(Article){ |ar,scope| ar.send(scope) }

来源：https://stackoverflow.com/questions/27082253/how-to-call-an-array-of-scopes-on-an-activerecord-object